Lv4 Games, a team of dedicated Castlevania fans, has created a fan-made game called Castlevania ReVamped that aims to bring together the nostalgic aesthetics of the NES-era Castlevania games with the modern, non-linear gameplay of Metroidvanias. This blend of classic and contemporary elements results in an impressive mix that stands up to Konami’s own work in the genre.
The Linux version is compatible with Steam Deck, and you can find the download links in the article. If you’re interested in experiencing this unique take on Castlevania, be sure to check it out!
From the description on their YouTube video:
Version 1.1 (CURRENT VERSION)
Windows: https://drive.google.com/file/d/1YU_33kG2xShrPknpI0GsxjX3g52oN3Hh/view?usp=sharing
Linux: https://drive.google.com/file/d/1oH3lodPnZEH86maA_mc8YKthxNV3FzZq/view?usp=sharing